usb: gadget: renesas_usbhs: bugfix: don't modify platform data
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / renesas_usbhs / mod.c
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1/*
2 * Renesas USB driver
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15 *
16 */
17#include <linux/interrupt.h>
18
19#include "./common.h"
20#include "./mod.h"
21
22#define usbhs_priv_to_modinfo(priv) (&priv->mod_info)
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23#define usbhs_mod_info_call(priv, func, param...) \
24({ \
25 struct usbhs_mod_info *info; \
26 info = usbhs_priv_to_modinfo(priv); \
27 !info->func ? 0 : \
28 info->func(param); \
29})
30
31/*
32 * autonomy
33 *
34 * these functions are used if platform doesn't have external phy.
35 * -> there is no "notify_hotplug" callback from platform
36 * -> call "notify_hotplug" by itself
37 * -> use own interrupt to connect/disconnect
38 * -> it mean module clock is always ON
39 * ~~~~~~~~~~~~~~~~~~~~~~~~~
40 */
41static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
42{
43 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
44
45 return VBSTS & usbhs_read(priv, INTSTS0);
46}
47
48static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
49 struct usbhs_irq_state *irq_state)
50{
51 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
52
53 return usbhsc_drvcllbck_notify_hotplug(pdev);
54}
55
56void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
57{
58 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
59
60 info->irq_vbus = usbhsm_autonomy_irq_vbus;
48298206 61 priv->pfunc.get_vbus = usbhsm_autonomy_get_vbus;
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62
63 usbhs_irq_callback_update(priv, NULL);
64}
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65
66/*
67 * host / gadget functions
68 *
69 * renesas_usbhs host/gadget can register itself by below functions.
70 * these functions are called when probe
71 *
72 */
73void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
74{
75 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
76
77 info->mod[id] = mod;
78 mod->priv = priv;
79}
80
81struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
82{
83 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
84 struct usbhs_mod *ret = NULL;
85
86 switch (id) {
87 case USBHS_HOST:
88 case USBHS_GADGET:
89 ret = info->mod[id];
90 break;
91 }
92
93 return ret;
94}
95
0deb3e77 96int usbhs_mod_is_host(struct usbhs_priv *priv)
f1407d5c 97{
0deb3e77 98 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
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99 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
100
101 if (!mod)
102 return -EINVAL;
103
104 return info->mod[USBHS_HOST] == mod;
105}
106
107struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
108{
109 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
110
111 return info->curt;
112}
113
114int usbhs_mod_change(struct usbhs_priv *priv, int id)
115{
116 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
117 struct usbhs_mod *mod = NULL;
118 int ret = 0;
119
120 /* id < 0 mean no current */
121 switch (id) {
122 case USBHS_HOST:
123 case USBHS_GADGET:
124 mod = info->mod[id];
125 break;
126 default:
127 ret = -EINVAL;
128 }
129 info->curt = mod;
130
131 return ret;
132}
133
134static irqreturn_t usbhs_interrupt(int irq, void *data);
135int usbhs_mod_probe(struct usbhs_priv *priv)
136{
137 struct device *dev = usbhs_priv_to_dev(priv);
138 int ret;
139
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140 /*
141 * install host/gadget driver
142 */
034d7c13 143 ret = usbhs_mod_host_probe(priv);
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144 if (ret < 0)
145 return ret;
146
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147 ret = usbhs_mod_gadget_probe(priv);
148 if (ret < 0)
149 goto mod_init_host_err;
150
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151 /* irq settings */
152 ret = request_irq(priv->irq, usbhs_interrupt,
b5dd18d8 153 0, dev_name(dev), priv);
2f98382d 154 if (ret) {
f1407d5c 155 dev_err(dev, "irq request err\n");
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156 goto mod_init_gadget_err;
157 }
158
159 return ret;
160
161mod_init_gadget_err:
162 usbhs_mod_gadget_remove(priv);
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163mod_init_host_err:
164 usbhs_mod_host_remove(priv);
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165
166 return ret;
167}
168
169void usbhs_mod_remove(struct usbhs_priv *priv)
170{
034d7c13 171 usbhs_mod_host_remove(priv);
2f98382d 172 usbhs_mod_gadget_remove(priv);
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173 free_irq(priv->irq, priv);
174}
175
176/*
177 * status functions
178 */
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179int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
180{
181 int state = irq_state->intsts0 & DVSQ_MASK;
182
183 switch (state) {
184 case POWER_STATE:
185 case DEFAULT_STATE:
186 case ADDRESS_STATE:
187 case CONFIGURATION_STATE:
188 return state;
189 }
190
191 return -EIO;
192}
193
194int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
195{
196 /*
197 * return value
198 *
199 * IDLE_SETUP_STAGE
200 * READ_DATA_STAGE
201 * READ_STATUS_STAGE
202 * WRITE_DATA_STAGE
203 * WRITE_STATUS_STAGE
204 * NODATA_STATUS_STAGE
205 * SEQUENCE_ERROR
206 */
207 return (int)irq_state->intsts0 & CTSQ_MASK;
208}
209
210static void usbhs_status_get_each_irq(struct usbhs_priv *priv,
211 struct usbhs_irq_state *state)
212{
213 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
214
215 state->intsts0 = usbhs_read(priv, INTSTS0);
216 state->intsts1 = usbhs_read(priv, INTSTS1);
217
f1407d5c 218 /* mask */
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219 if (mod) {
220 state->brdysts = usbhs_read(priv, BRDYSTS);
221 state->nrdysts = usbhs_read(priv, NRDYSTS);
222 state->bempsts = usbhs_read(priv, BEMPSTS);
223
224 state->bempsts &= mod->irq_bempsts;
225 state->brdysts &= mod->irq_brdysts;
226 }
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227}
228
229/*
230 * interrupt
231 */
232#define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
233#define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
234static irqreturn_t usbhs_interrupt(int irq, void *data)
235{
236 struct usbhs_priv *priv = data;
237 struct usbhs_irq_state irq_state;
238
239 usbhs_status_get_each_irq(priv, &irq_state);
240
241 /*
242 * clear interrupt
243 *
244 * The hardware is _very_ picky to clear interrupt bit.
245 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
246 *
247 * see
248 * "Operation"
249 * - "Control Transfer (DCP)"
250 * - Function :: VALID bit should 0
251 */
252 usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
253 usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
254
255 usbhs_write(priv, BRDYSTS, 0);
256 usbhs_write(priv, NRDYSTS, 0);
257 usbhs_write(priv, BEMPSTS, 0);
258
259 /*
260 * call irq callback functions
261 * see also
262 * usbhs_irq_setting_update
263 */
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264
265 /* INTSTS0 */
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266 if (irq_state.intsts0 & VBINT)
267 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
268
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269 if (irq_state.intsts0 & DVST)
270 usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
271
272 if (irq_state.intsts0 & CTRT)
273 usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
274
275 if (irq_state.intsts0 & BEMP)
276 usbhs_mod_call(priv, irq_empty, priv, &irq_state);
277
278 if (irq_state.intsts0 & BRDY)
279 usbhs_mod_call(priv, irq_ready, priv, &irq_state);
280
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281 /* INTSTS1 */
282 if (irq_state.intsts1 & ATTCH)
283 usbhs_mod_call(priv, irq_attch, priv, &irq_state);
284
285 if (irq_state.intsts1 & DTCH)
286 usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
287
288 if (irq_state.intsts1 & SIGN)
289 usbhs_mod_call(priv, irq_sign, priv, &irq_state);
290
291 if (irq_state.intsts1 & SACK)
292 usbhs_mod_call(priv, irq_sack, priv, &irq_state);
293
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294 return IRQ_HANDLED;
295}
296
297void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
298{
299 u16 intenb0 = 0;
89c1d2e7 300 u16 intenb1 = 0;
b002ff6e 301 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
f1407d5c 302
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303 /*
304 * BEMPENB/BRDYENB are picky.
305 * below method is required
306 *
307 * - clear INTSTS0
308 * - update BEMPENB/BRDYENB
309 * - update INTSTS0
310 */
f1407d5c 311 usbhs_write(priv, INTENB0, 0);
89c1d2e7 312 usbhs_write(priv, INTENB1, 0);
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313
314 usbhs_write(priv, BEMPENB, 0);
315 usbhs_write(priv, BRDYENB, 0);
316
317 /*
318 * see also
319 * usbhs_interrupt
320 */
321
322 /*
323 * it don't enable DVSE (intenb0) here
324 * but "mod->irq_dev_state" will be called.
325 */
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326 if (info->irq_vbus)
327 intenb0 |= VBSE;
f1407d5c 328
5ea68d54 329 if (mod) {
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330 /*
331 * INTSTS0
332 */
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333 if (mod->irq_ctrl_stage)
334 intenb0 |= CTRE;
f1407d5c 335
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336 if (mod->irq_empty && mod->irq_bempsts) {
337 usbhs_write(priv, BEMPENB, mod->irq_bempsts);
338 intenb0 |= BEMPE;
339 }
f1407d5c 340
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341 if (mod->irq_ready && mod->irq_brdysts) {
342 usbhs_write(priv, BRDYENB, mod->irq_brdysts);
343 intenb0 |= BRDYE;
344 }
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345
346 /*
347 * INTSTS1
348 */
349 if (mod->irq_attch)
350 intenb1 |= ATTCHE;
351
352 if (mod->irq_attch)
353 intenb1 |= DTCHE;
354
355 if (mod->irq_sign)
356 intenb1 |= SIGNE;
357
358 if (mod->irq_sack)
359 intenb1 |= SACKE;
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360 }
361
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362 if (intenb0)
363 usbhs_write(priv, INTENB0, intenb0);
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364
365 if (intenb1)
366 usbhs_write(priv, INTENB1, intenb1);
f1407d5c 367}